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 ###Instrução: altitude above the Earth's surface of 500 to 39,900 km has what orbital period?
 ###Tabelas: CREATE TABLE group_3 (group_3_id AUTO_INCREMENT PRIMARY KEY, Home team VARCHAR, Home team score VARCHAR, Away team VARCHAR, Away team score VARCHAR, Ground VARCHAR, Date VARCHAR, Crowd INT) CREATE TABLE big_five_it_services_company (big_five_it_services_company_id AUTO_INCREMENT PRIMARY KEY, Firm VARCHAR, Revenues VARCHAR, Employees INT, Fiscal Year INT, Headquarters VARCHAR) CREATE TABLE camera (camera_id AUTO_INCREMENT PRIMARY KEY, Camera VARCHAR, Sensor resolution VARCHAR, Sensor VARCHAR, Output VARCHAR, CPU usage VARCHAR, IR LEDs VARCHAR) CREATE TABLE escape_velocities_at_altitude (escape_velocities_at_altitude_id AUTO_INCREMENT PRIMARY KEY, orbit VARCHAR, center-to-center distance VARCHAR, altitude above the Earth's surface VARCHAR, Orbital period VARCHAR, specific orbital energy VARCHAR) CREATE TABLE women's_doubles:_15_3_titles_5_runner-ups (women's_doubles:_15_3_titles_5_runner-ups_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents VARCHAR, Score VARCHAR)  
SELECT Orbital period FROM escape_velocities_at_altitude WHERE altitude above the Earth's surface = 500 to 39,900 km